<b>Bioleaching of metals from tannery sludge in two stages: effect of pH</b> - DOI: 10.4025/actascitechnol.v31i2.449

Authors

  • Fábio Moreira da Silva UEM
  • Fabrí­cia Maribondo da Silva Ramos UEM
  • Antonio Carlos Augusto da Costa
  • Célia Regina Granhen Tavares UEM

DOI:

https://doi.org/10.4025/actascitechnol.v31i2.449

Keywords:

bioleaching, elemental sulfur, Chromium, tannery sludge

Abstract

The present work assessed the effect of the pH in the bioleaching of Cr and other metals from tannery sludge with stage separation of biologic oxidation of elemental sulfur and leaching of solid waste. The concentration of elemental sulfur was 5 g L-1. The final bioleaching pH ranged from 3.0 to 1.0. The concentration of sludge solids was 100 g L-1 and the temperatures were 298.15 and 308.15 K. The leaching extractions of Al, Cr and Zn increased at lower final pH and the leaching extraction of Ca decreased in this condition. The maximum extraction of Cr was 70.11% at sludge solids concentration of 100 g L-1, final pH 1.0 and temperature of 298.15 K. The fraction of Cr bound to Fe and Mn oxides was more affected by changes at final pH than others fractions. The mass ratio of metals and Cr decreased at lower final pH. The concentration of Cr leached from the tannery sludge after the bioleaching at final pH of 1.0 was reduced to satisfactory values.

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Author Biography

Fábio Moreira da Silva, UEM

Tem experiência na área de Engenharia Quí­mica, com ênfase em Tratamento de Efluentes e Resí­duos Sólidos, atuando principalmente nos seguintes temas: tratamento biológico de efluentes lí­quidos e biolixiviação de resí­duos sólidos. Currí­culo Lattes

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Published

2009-06-17

How to Cite

Silva, F. M. da, Ramos, F. M. da S., Costa, A. C. A. da, & Tavares, C. R. G. (2009). <b>Bioleaching of metals from tannery sludge in two stages: effect of pH</b> - DOI: 10.4025/actascitechnol.v31i2.449. Acta Scientiarum. Technology, 31(2), 167–173. https://doi.org/10.4025/actascitechnol.v31i2.449

Issue

Vol. 31 No. 2 (2009)

Section

Chemical Engineering

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